<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../js/vue.js"></script>
</head>
<body>
<div id="app">
    <input v-model="message">
    {{message}}
</div>
</body>
<script>
    new Vue({
        el: '#app',
        data:{
            message:''
        }
    });
</script>
</html>